would depend on the situation really. In a child restriant group, yep. Why not everyone else does.
If you think the child is in direct danger, then yes.
But if its after market accessories, or something that doesnt meet standards, I would politely ask where they got it/them from as I was sure they were unsafe, taken off the market etc.
BUt in my case, normally someone else brings it up before I ever get the chance to comment on the picture